JPS642833Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention is an invention related to a seat device for a tractor.

(b) Prior Art Conventionally, in a rice transplanter, a technology such as Japanese Utility Model Application No. 54-7123 is known as a technology in which a pair of seats are provided on the left and right sides of the steering handle.

In addition, a technique for arranging a seat eccentrically with respect to the left-right center of the vehicle body in a transport vehicle is known as disclosed in Japanese Utility Model Application No. 75523/1983.

(c) Problems to be solved by the invention To ensure normal operation, the operator of the tractor is supposed to sit facing the front of the machine, which is the direction of travel, and the seat should be aligned with the left and right center line of the tractor. , are usually formed bilaterally symmetrically.

However, when performing work such as cultivating a field, the operator must constantly look back in an unnatural position to check the working status of the work equipment or to check for obstacles when reversing, which makes the work difficult. Over long periods of time, drivers become extremely fatigued, leading to lower back and neck pain, which is not good for occupational health, and drivers have expressed their desire for improvements.

The present invention solves these problems of conventional seats.

(d) Means for solving the problem The purpose of the present invention is as described above, and the configuration for achieving the purpose will be explained below: A tractor seat 32 that can slide forward and backward and rotate left and right. The center of rotation of the seat 32 is arranged on the left-right center line of the aircraft, and the seat 32 constituting the seat 32 is
When a is divided into two along the left-right center line of the machine, the side on which the hydraulic operating lever 24 for lifting and lowering the work equipment is arranged has a smaller width that projects laterally from the left-right center line of the machine,
The side on which the hydraulic operating lever 24 is not disposed has a larger width that projects laterally from the left-right center line of the body, and the seat 32a is symmetrical with respect to the left-right center line of the body.

(E) Embodiment The purpose and structure of the present invention are as described above, and the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side view of a tractor, in which an engine 2 is disposed within a bonnet 1, and a front axle bracket 3 is fixed to the front lower part of the engine 2. A front wheel differential case 4 and a front axle are supported on the front axle bracket 3, and front wheels 5, 5 are supported at the tip of the front axle.

A clutch housing 6 is fixed to the rear surface of the engine 2, a transmission case 8 is fixed to the rear surface of the clutch housing 6, and a rear axle case 9 is further fixed to the rear surface of the transmission case 8. Rear axle housing 1 on both sides of rear axle case 9
A rear axle housing 10 supports a rear axle 11, and a rear wheel 12 is provided at the tip of the rear axle 11.
is permanently installed.

A front wheel power extraction gear box is provided on the lower surface of the transmission case 8, and power is transmitted to the front wheel differential case 4 through a power transmission shaft inside the safety case 7. A step 27 is provided over the sides of the clutch housing 6 and the transmission case 8, and an auxiliary step 28 for getting on and off is provided at the tip of the step 27.

In addition, a clutch pedal 32 is installed in front of the step 27.
is provided. A PTO shaft 17 protrudes from the rear surface of the rear axle case 9, and a three-point link type work machine mounting device consisting of a top link 13 and two lower links 14L and 14R is provided.

A field cultivation work machine or the like is attached to the three-point link type work machine mounting device, and is raised and lowered by a lift arm 16 via a lift link 15.

The lift arm 16 is moved up and down by a hydraulic cylinder and piston in a hydraulic device 18, and the vertical movement is switched by operating a hydraulic control valve in the hydraulic device 18 with a hydraulic control lever 24. The hydraulic operating lever 24 is provided on the side of the seat device A at the closest position.

In the case of a tractor, there are many levers operated by the operator, but during work, the hydraulically operated lever is used second most often after the main gear shift lever 20, and is often operated while looking back. It is located on the side of the seat.

In particular, since many people are right-handed, the hydraulic control lever 24, which is frequently used from an ergonomic standpoint, is often provided on the right side of the seat.

The operator rotated the hydraulic control lever 24 while twisting his body to monitor the work equipment and the like at the rear of the machine.

The levers 20 and 21 arranged side by side on the transmission case 8 are a main shift lever 20 and an auxiliary shift lever 21, and since they are often operated while looking straight ahead, they are provided at the front lower part of the seat. .

Reference numeral 23 denotes a front wheel drive clutch lever, which is provided below the left side of the seat device A because it is rarely used. 19 is a steering handle, 25 is a fender, and 26 is an assist bar.

FIG. 2 is a plan view of the vicinity of the seat device A in FIG. 1, FIG. 3 is a side sectional view of the seat device, FIGS. 4 and 5,
FIGS. 6, 7, and 8 are drawings showing an embodiment of the seat, and FIGS. 9 to 12 are drawings showing the configuration of the rotation and sliding device of the seat.

As shown in Fig. 2, the present invention allows an operator to rotate his or her entire body when sitting on a seat 32 and operating a hydraulic control lever 24 without twisting the jaw or waist when looking at a working machine at the rear. seat 32 so that
The entire structure is rotatable.

The center of rotation of the seat 32 is located on the left-right center line of the tractor body.

Furthermore, in order to make it easier to move the entire body when the seat 32 cannot be rotated in time, the seat 32a in the area where the feet rest has been shaved to reduce the amount of protrusion, making it easier for the feet to rotate. .

That is, if the seat 32a is divided into left and right sides by the left-right center line of the aircraft body and the amount of protrusion from the center line is compared, the amount of protrusion on the side where the left and right operating lever 24 is located is smaller, and the amount of protrusion on the side where the hydraulic operating lever 24 is not located is smaller. By increasing the amount, the left and right sides are configured asymmetrically.

In the embodiments of FIGS. 2, 3, and 4,
The backrest 32b of the seat 32 is provided in a symmetrical shape as before, and only the seat 32a is shown as having an asymmetrical shape, and in FIGS. 6 and 7, the backrest 32b as well as the seat 32a are also made asymmetrical An example is shown.

In the embodiment shown in FIG. 8, the upper right side of the backrest is further shaved to make it easier for the operator to turn around.

10 to 12 show the rotation device of the seat apparatus A.

A sliding rail plate 39 is welded and fixed to the bottom plate of the seat 32a. Both ends of the sliding rail plate 39 are bent into a U-shape and the rollers 34 are fitted therein, so that the sliding rail plate 39 can be slid back and forth. The roller 34 is bearing-supported on a roller support 33 , and a thrust bearing 3 is provided between the roller support 33 and the seat base 35 .
6, the seat A is rotatably supported.

The center of the thrust bearing 36 and the seat base 35 is
It is located approximately on the left and right center line of the tractor.

A disk-shaped stopper plate 37 is fixed to the seat base 35, and the rotation stopper engagement pin 38b of the stopper 38 is fixed to the seat base 35.
Engagement holes 37a into which the screws are inserted are formed at several locations on the circumference.

The stopper 38 is provided with a sliding tube 33a on the front protrusion of the roller support 33, and a stopper body 38d is fitted into the sliding tube 33a so as to be vertically slidable. A rotation stop engagement pin 3 is attached to the stopper body 38d.
8b and a longitudinal motion stop engagement pin 38a are configured to be slidable back to back, and a spring 38c is inserted between both engagement pins. The middle part of the seat adjustment lever 30 is welded and fixed to the stopper body 38d, and by moving the seat adjustment lever 30 up and down about the pivot shaft 42, when the seat adjustment lever 30 is rotated upward, the rotation stop engagement pin 38b is engaged. If the seat adjustment lever 30 is released from the engagement hole 37a of the stopper plate 37 and is free to rotate, and the seat adjustment lever 30 is returned to the free position, the rotation stop engagement pin 38b will be removed from the stopper plate 37 after being rotated by a certain angle. It fits into the engagement hole 37a and stops rotating.

Also, if you rotate the seat adjustment lever 30 downward,
The longitudinal motion stopping engagement pin 38a is removed from the engagement hole 39a of the sliding rail plate 39, allowing for longitudinal sliding. If the operator returns the seat adjustment lever 30 to the free position after sliding it using his or her hips, the longitudinal motion stop engagement pin 38a will move back and forth to the other engagement position of the sliding rail plate 39 after it has slid back and forth to a certain extent. It enters the mating hole 39a and the front and rear sliding movement is fixed.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, when a tractor performs work while moving its body forward, the operator has to move while monitoring the status of the work equipment attached to the rear of the machine, and the operator turns around many times.

In order to adjust the position of the work equipment, the seat 32
The operator rotates the hydraulic control lever 24 of the hydraulic device 18 provided on the side of the machine, but even when the operator twists his body to check the condition of the work machine while operating the hydraulic control lever 24, Since the right side of the seat 32a is missing, the entire body including the legs can be rotated to a certain extent.

As a result, even when the operator's arm twists the body while grasping the hydraulic operating lever 24, the position of the hand grasping the hydraulic operating lever 24 and the body will not be twisted into an unreasonable position, and the arm and shoulder This eliminates the problem of increasing fatigue.

Second, since the seat 32 can be rotated left and right between the thrust bearing 35 and the seat base, there is no need to forcibly twist the lower back or twist the neck as in the past, which reduces the back pain of the operator.・It was possible to minimize fatigue such as neck pain.

[Brief explanation of drawings]

Fig. 1 is an overall side view of the tractor, Fig. 2 is a plan view of the vicinity of the seat device A of the tractor shown in Fig. 1, Fig. 3 is a side sectional view of the seat device A, Figs.
Figures 6, 7, and 8 are drawings showing an embodiment of seat A, Figure 9 is a plan view showing the rotation and sliding device of the seat, Figure 10 is a rear sectional view, and Figure 11. 12 is a plan view of the stopper plate 37, and FIG. 12 is a side sectional view of the stopper device. A... Seat device, 18... Hydraulic system, 24...
Hydraulic operation lever, 30... Seat adjustment lever, 32
... Seat, 32a... Seat, 32b... Backrest.

Claims (1)

[Scope of utility model registration request] The center of rotation of the tractor seat 32, which can slide back and forth and rotate left and right, is placed on the left and right center line of the aircraft body, and the seat 32 that constitutes the seat 32
When a is divided into two along the left-right center line of the machine, the side on which the hydraulic operating lever 24 for lifting and lowering the work equipment is arranged has a smaller width that projects laterally from the left-right center line of the machine,
This tractor seat device is characterized in that the side on which the hydraulic operating lever 24 is not disposed has a larger width that projects laterally from the left-right center line of the machine body, and the seat 32a is asymmetrical with respect to the left-right center line of the machine body.